Method for detecting uplink signal and relevant device and system

ABSTRACT

A method for detecting an uplink signal includes: detecting, by a micro base station according to configuration information about an uplink signal sent by a UE, whether the uplink signal is received in an uplink receive window of a macro base station, where the macro base station and the micro base station have synchronized clock rates, there is a fixed time difference t 1  between the uplink receive window of the macro base station and an uplink receive window of the micro base station, and |t 1 |≧0; and if it is detected that the uplink signal is not received in the uplink receive window of the macro base station, after the micro base station advances the uplink receive window of the macro base station by a length of at least one cyclic prefix, detecting, by the micro base station, the uplink signal, and sending the uplink signal to the macro base station.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2012/075830, filed on May 21, 2012, which is hereby incorporatedby reference in its entirety.

TECHNICAL FIELD

The present invention relates to the field of communicationstechnologies, and in particular, to a method for detecting an uplinksignal and a relevant device and system.

BACKGROUND

As the number of user terminals (User Equipment, UE) constantlyincreases, micro base stations are increasingly deployed in a network ofan operator, so as to distribute the data traffic of a macro basestation and lower the processing pressure of the macro base station.This kind of network with mixed deployment of a macro base station andmicro base stations is also referred to as a heterogeneous network(HetNet).

Referring to FIG. 1, FIG. 1 is a schematic diagram of an existingheterogeneous network. In the heterogeneous network shown in FIG. 1,when a UE served by a macro base station is outside a downlink coveragearea of a micro base station and is located at an edge of the downlinkcoverage area of the micro base station, an uplink signal from the UEserved by the macro base station to the macro base station causes uplinkinterference to the micro base station, and in this case, the UE servedby the macro base station may be referred to as an interference sourceof the micro base station. To identify an interference source of a microbase station, some methods are currently put forward in the industry.These methods include: detecting, by a micro base station, an uplinksounding reference signal (SRS), an uplink preamble, or an uplinkdemodulation reference signal (DMRS) of a UE served by a macro basestation, and feeding the uplink sounding reference signal, the uplinkpreamble, or the uplink demodulation reference signal back to the macrobase station; and completing, by the macro base station, identificationof an interference source.

In actual application, a base station can only successfully detect anuplink signal when the uplink signal of a UE served by the base stationreaches the base station in an interval from a starting point of areceive window of the base station to ending of a cyclic prefix (CP). Tomeet this requirement, the base station generally allocates timingadvanced (TA) to the UE, so as to enable the UE to learn how long theuplink signal should be sent ahead of time, so that the uplink signal ofthe UE may reach the base station in the interval from the startingpoint of the receive window of the base station to the ending of thecyclic prefix (CP).

In a heterogeneous network, when a UE served by a macro base station isoutside a downlink coverage area of a micro base station, but is locatedat an edge of the downlink coverage area of the micro base station, theUE served by the macro base station sends an uplink signal by using TAallocated by the macro base station, because the UE is far from themacro base station, the TA allocated by the macro base station to the UEis generally large; because the UE is close to the micro base station,the uplink signal sent by the UE may reach the micro base station beforea starting point of a receive window of the micro base station, so thatthe micro base station cannot detect the uplink signal sent by the UE.

SUMMARY

To solve the technical problems, embodiments of the present inventionprovide a method for detecting an uplink signal and a relevant deviceand system, so as to effectively detect an uplink signal of a UE.

In one aspect, an embodiment of the present invention provides a methodfor detecting an uplink signal, which includes:

detecting, by a micro base station according to configurationinformation of a user equipment for sending an uplink signal, whetherthe uplink signal is received in an uplink receive window of a macrobase station, where the macro base station and the micro base stationhave synchronized clock rates, there is a fixed time difference t1between the uplink receive window of the macro base station and anuplink receive window of the micro base station, and |t1|≧0; and

if it is detected that the uplink signal is not received in the uplinkreceive window of the macro base station, after the micro base stationadvances the uplink receive window of the macro base station by a lengthof at least one cyclic prefix, again detecting, by the micro basestation, the uplink signal, and sending the uplink signal to the macrobase station.

In another aspect, an embodiment of the present invention provides amethod for detecting an uplink signal, which includes:

receiving, by a user equipment, a timing advanced update message sent bya macro base station, where the timing advanced update message is usedfor instructing to decrease timing advanced allocated by the macro basestation to the user equipment to preset timing advanced; and

after the user equipment decreases the timing advanced allocated by themacro base station to the preset timing advanced, sending, by the userequipment, an uplink signal according to the preset timing advanced, sothat a micro base station detects the uplink signal in an uplink receivewindow of the macro base station according to configuration informationof the user equipment for sending the uplink signal and sends the uplinksignal to the macro base station, where the macro base station and themicro base station have synchronized clock rates, there is a fixed timedifference t1 between the uplink receive window of the macro basestation and an uplink receive window of the micro base station, and|t1|≧0.

Correspondingly, in one aspect, an embodiment of the present inventionprovides a device for detecting an uplink signal applied in a micro basestation, and the device for detecting an uplink signal includes:

a detecting unit, configured to detect, according to configurationinformation of a user equipment for sending an uplink signal, whetherthe uplink signal is received in an uplink receive window of a macrobase station, where the macro base station and the micro base stationhave synchronized clock rates, there is a fixed time difference t1between the uplink receive window of the macro base station and anuplink receive window of the micro base station, and |t1|≧0;

a control unit, configured to advance the uplink receive window of themacro base station by a length of at least one cyclic prefix when thedetecting unit detects that the uplink signal is not received in theuplink receive window of the macro base station, where

the detecting unit is further configured to detect the uplink signalafter the control unit advances the uplink receive window of the macrobase station by the length of at least one cyclic prefix; and

a sending unit, configured to send the uplink signal detected by thedetecting unit to the macro base station.

Correspondingly, in another aspect, an embodiment of the presentinvention provides a user equipment, and the user equipment includes:

a receiving unit, configured to receive a timing advanced update messagesent by a macro base station, where the timing advanced update messageis used for instructing to decrease timing advanced allocated by themacro base station to the user equipment to preset timing advanced;

a control unit, configured to decrease the timing advanced allocated bythe macro base station to the preset timing advanced; and

a sending unit, configured to, after the control unit decreases thetiming advanced allocated by the macro base station to the preset timingadvanced, send an uplink signal according to the preset timing advanced,so that a micro base station detects the uplink signal in an uplinkreceive window of the macro base station according to configurationinformation of the sending unit for sending the uplink signal and sendsthe uplink signal to the macro base station, where the macro basestation and the micro base station have synchronized clock rates, thereis a fixed time difference t1 between the uplink receive window of themacro base station and an uplink receive window of the micro basestation, and |t1|≧0.

Correspondingly, in one aspect, an embodiment of the present inventionfurther provides a system for detecting an uplink signal, whichincludes:

a user equipment, a micro base station, and a macro base station, where

the user equipment is served by the macro base station, and the userequipment is located outside a downlink coverage area of the micro basestation and at an edge of the downlink coverage area of the micro basestation; and the macro base station and the micro base station havesynchronized clock rates, there is a fixed time difference t1 between anuplink receive window of the macro base station and an uplink receivewindow of the micro base station, and |t1|≧0;

the micro base station includes the above device for detecting an uplinksignal;

the user equipment is configured to send an uplink signal; and

the macro base station is configured to receive the uplink signal sentby the user equipment and detected by the micro base station.

Correspondingly, in another aspect, an embodiment of the presentinvention further provides another system for detecting an uplinksignal, which includes:

a micro base station, a macro base station, and the user equipmentprovided by the embodiment of the present invention in another aspect,where

the user equipment is served by the macro base station, and the userequipment is located outside a downlink coverage area of the micro basestation and at an edge of the downlink coverage area of the micro basestation; and the macro base station and the micro base station havesynchronized clock rates, there is a fixed time difference t1 between anuplink receive window of the macro base station and an uplink receivewindow of the micro base station, and |t1|≧0;

the macro base station is configured to send a timing advanced updatemessage to the user equipment, where the timing advanced update messageis used for instructing to decrease timing advanced allocated by themacro base station to the user equipment to preset timing advanced; andreceive an uplink signal sent by the user equipment and detected by themicro base station; and

the micro base station is configured to detect the uplink signal in theuplink receive window of the macro base station according toconfiguration information about the uplink signal sent by the userequipment, and send the uplink signal to the macro base station.

In the embodiments of the present invention, the macro base station andthe micro base station have synchronized clock rates, and there is afixed time difference t1 between the uplink receive window of the macrobase station and the uplink receive window of the micro base station,where |t1|≧0. On such basis, in one aspect, the micro base station maydetect, according to the configuration information of the user equipmentfor sending an uplink signal, whether the uplink signal is received inthe uplink receive window of the macro base station, and if not, afteradvancing the uplink receive window of the macro base station by thelength of at least one cyclic prefix, the micro base station may againdetect the uplink signal and send the uplink signal to the macro basestation. In another aspect, after decreasing the timing advancedallocated by the macro base station to the preset timing advancedaccording to a timing advanced update message sent by the macro basestation, the user equipment may send an uplink signal according to thepreset timing advanced, so that the micro base station may detect theuplink signal in the uplink receive window of the macro base stationaccording to the configuration information of the user equipment forsending the uplink signal, and send the uplink signal to the macro basestation. Therefore, it is implemented that the micro base stationeffectively detects the uplink signal of the user equipment, so that themacro base station can identify the user equipment causing uplinkinterference to the micro base station, thereby eliminating theinterference. Meanwhile, in the embodiments of the present invention,the processing burden caused by multiple times of detection constantlyperformed by the micro base station on all resources may also beavoided.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions of the embodiments of the presentinvention more clearly, the accompanying drawings for describing theembodiments are briefly described below. Apparently, the accompanyingdrawings in the following description are only some embodiments of thepresent invention, and persons of ordinary skill in the art may deriveother drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of an existing heterogeneous network;

FIG. 2 to FIG. 8 are schematic flow charts of several embodiments of amethod for detecting an uplink signal provided in an embodiment of thepresent invention;

FIG. 9 is a schematic structural diagram of an embodiment of a devicefor detecting an uplink signal provided in an embodiment of the presentinvention;

FIG. 10 is a schematic structural diagram of an embodiment of a userequipment provided in an embodiment of the present invention; and

FIG. 11 and FIG. 12 are schematic structural diagrams of two embodimentsof a system for detecting an uplink signal provided in an embodiment ofthe present invention.

DESCRIPTION OF EMBODIMENTS

The following clearly and comprehensively describes the technicalsolutions in the embodiments of the present invention with reference tothe accompanying drawings in the embodiments of the present invention.Apparently, the described embodiments are merely a part rather than allof the embodiments of the present invention. All other embodimentsobtained by a person of ordinary skill in the art based on theembodiments of the present invention without creative efforts shall fallwithin the protection scope of the present invention.

Embodiments of the present invention provide a method for detecting anuplink signal and a relevant device and system, which may effectivelydetect an uplink signal of a UE, including a UE served by a macro basestation and located outside a downlink coverage area of a micro basestation and at an edge of the downlink coverage area of the micro basestation, so that the macro base station may identify a user equipmentcausing uplink interference to the micro base station, therebyeliminating the interference, and further avoiding the processing burdencaused by multiple times of detection constantly performed by the microbase station on all resources, which are respectively illustrated indetail in the following.

Referring to FIG. 2, FIG. 2 is a flow chart of a method for detecting anuplink signal provided in an embodiment of the present invention. Asshown in FIG. 2, the method for detecting an uplink signal may includethe following steps.

201: A micro base station detects, according to configurationinformation of a UE for sending an uplink signal, whether the uplinksignal is received in an uplink receive window of a macro base station,where the macro base station and the micro base station havesynchronized clock rates, there is a fixed time difference t1 betweenthe uplink receive window of the macro base station and an uplinkreceive window of the micro base station, and |t1|≧0.

In an embodiment, the UE may be served by the macro base station, andthe UE may be located outside a downlink coverage area of the micro basestation and at an edge of the downlink coverage area of the micro basestation. Therefore, the micro base station may effectively detect anuplink signal of the UE served by the macro base station and locatedoutside the downlink coverage area of the micro base station and at anedge of the downlink coverage area of the micro base station, so thatthe macro base station may identify a user equipment causing uplinkinterference to the micro base station, thereby eliminating theinterference.

In an embodiment, the configuration information used for sending theuplink signal may include a sending frequency, sending time, a hoppingsequence and the like used for sending the uplink signal. That is tosay, the configuration information used for sending the uplink signalmay at least include a sending resource used for sending the uplinksignal.

In the embodiment of the present invention, when |t1|=0, it indicatesthat clocks of the macro base station and the micro base station areperfectly aligned, and at this time, the uplink receive window of themacro base station and the uplink receive window of the micro basestation are the same. When |t1|≠0, it indicates that the clocks of themacro base station and the micro base station are not aligned, and atthis time, there is a fixed time difference t1 between the uplinkreceive window of the macro base station and the uplink receive windowof the micro base station.

202: If it is detected that the uplink signal is not received in theuplink receive window of the macro base station, after advancing theuplink receive window of the macro base station by a length of at leastone CP, the micro base station again detects the uplink signal and sendsthe uplink signal to the macro base station.

In actual application, if it is detected that the uplink signal is notreceived in the uplink receive window of the macro base station, themicro base station may again detect the uplink signal after advancingthe uplink receive window of the macro base station by a length of oneCP, and if the uplink signal still cannot be detected, the micro basestation may again detect the uplink signal after further advancing theuplink receive window of the macro base station by a length of two CPsuntil the micro base station detects the uplink signal after advancingthe uplink receive window of the macro base station by a length of NCPs; and the micro base station sends the uplink signal to the macrobase station.

In an embodiment, if it is detected that the uplink signal is receivedin the uplink receive window of the macro base station, the micro basestation may also send the uplink signal or relevant information (forexample, a UE identifier) about the uplink signal to the macro basestation, so that the macro base station may identify the user equipmentcausing uplink interference to the micro base station, therebyeliminating the interference.

As an optional implementation manner, in the method for detecting anuplink signal shown in FIG. 2, before step 201, the micro base stationmay also receive and store configuration information, sent by the macrobase station, about the uplink signal sent by the UE.

As another optional implementation manner, in the method for detectingan uplink signal shown in FIG. 2, before step 201, the micro basestation and the macro base station may also negotiate configurationinformation about the uplink signal sent by the UE, which is not limitedin the embodiment of the present invention.

As an optional implementation manner, in the method for detecting anuplink signal shown in FIG. 2, the uplink signal may be any one of anuplink SRS, an uplink Preamble, and an uplink DMRS, which is not limitedin the embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 2, the macrobase station and the micro base station have synchronized clock rates,and there is a fixed time difference t1 between the uplink receivewindow of the macro base station and the uplink receive window of themicro base station, where |t1|≧0. On such basis, the micro base stationmay detect, according to the configuration information about the uplinksignal sent by the UE, whether the uplink signal is received in theuplink receive window of the macro base station, and if not, afteradvancing the uplink receive window of the macro base station by thelength of at least one CP, the micro base station may again detect theuplink signal and send the uplink signal to the macro base station.Therefore, it is implemented that the micro base station effectivelydetects on the uplink signal sent by the UE, so that the macro basestation can identify the UE causing uplink interference to the microbase station, thereby eliminating the interference. Meanwhile, in theembodiment of the present invention, the processing burden caused bymultiple times of detection constantly performed by the micro basestation on all resources may also be avoided.

Referring to FIG. 3, FIG. 3 is a flow chart of another method fordetecting an uplink signal provided in an embodiment of the presentinvention. In the method for detecting an uplink signal shown in FIG. 3,it is assumed that a UE is served by a macro base station, and the UE islocated outside a downlink coverage area of a micro base station and atan edge of the downlink coverage area of the micro base station;meanwhile, the macro base station and the micro base station havesynchronized clock rates, and there is a fixed time difference t1between an uplink receive window of the macro base station and an uplinkreceive window of the micro base station, where |t1|=0. That is to say,clocks of the macro base station and the micro base station areperfectly aligned, and at this time, the uplink receive window of themacro base station and the uplink receive window of the micro basestation are the same. As shown in FIG. 3, the method for detecting anuplink signal may include the following steps.

301: The macro base station sends, to the micro base station,configuration information about an uplink SRS sent by the UE, andtriggers the micro base station to start detection of the uplink SRSsent by the UE.

302: The micro base station detects, according to the configurationinformation about the uplink SRS sent by the UE, whether the uplink SRSis received in the uplink receive window of the macro base station (orin the uplink receive window of the micro base station, which is thesame as the uplink receive window of the macro base station at thistime), if yes, execute step 304, and if not, execute step 303 and step304.

303: When the micro base station detects that the uplink SRS is notreceived in the uplink receive window of the macro base station (or inthe uplink receive window of the micro base station, which is the sameas the uplink receive window of the macro base station at this time) instep 302, the micro base station may again detect the uplink SRS afteradvancing the uplink receive window of the macro base station by alength of one CP, and execute step 304.

It is shown in practice that when the UE sends the uplink SRS accordingto the normal TA configured by the macro base station, it is very likelythat the uplink SRS reaches the micro base station before a startingpoint of the uplink receive window of the micro base station (which isthe same as the uplink receive window of the macro base station at thistime), and in most cases, timing advanced when the uplink SRS reachesthe starting point of the uplink receive window of the micro basestation (which is the same as the uplink receive window of the macrobase station at this time) in advance does not exceed the length of oneCP. That is to say, if a starting point of the uplink receive window ofthe macro base station is 0, the time when the uplink SRS of the UEreaches the micro base station is generally in a range of [−CP, +CP].Therefore, the micro base station may effectively detect the uplink SRSafter advancing the uplink receive window of the macro base station bythe length of one CP.

304: After detecting the uplink SRS sent by the UE, the micro basestation sends the uplink SRS or relevant information (for example, a UEidentifier) about the uplink SRS to the macro base station.

After receiving the uplink SRS sent by the micro base station, the macrobase station may identify that the UE sending the uplink SRS causesuplink interference to the micro base station. That is to say, the UE isan uplink interference source of the micro base station, and at thistime, the macro base station may eliminate the interference of the UE. Aspecific implementation manner in which the macro base station mayeliminate the interference of the UE is common knowledge to persons ofordinary skill in the art, so details are not described herein again inthe embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 3, step 302and step 303 may be arranged in a different order, or may be executed inparallel, which is not limited in the embodiment of the presentinvention. Further, execution of step 302 may be triggered by step 301,and termination of step 303 may be triggered by step 304. Of course, theexecution of step 302 may also be triggered by specific signalingbetween the macro base station and the micro base station, and thetermination of step 303 may also be triggered by specific signalingbetween the macro base station and the micro base station, which is notlimited in the embodiment of the present invention.

In an embodiment, the uplink SRS in the method for detecting an uplinksignal shown in FIG. 3 may also be replaced with an uplink Preamble oran uplink DMRS, which does not influence implementation of the presentinvention and is not limited in the embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 3, the UE isserved by the macro base station, and the UE is located outside thedownlink coverage area of the micro base station and at an edge of thedownlink coverage area of the micro base station; meanwhile, the macrobase station and the micro base station have synchronized clock rates,and there is a fixed time difference t1 between the uplink receivewindow of the macro base station and the uplink receive window of themicro base station, where |t1|=0. On such basis, the micro base stationmay detect, according to the configuration information about the uplinkSRS sent by the UE, whether the uplink signal is received in the uplinkreceive window of the macro base station, and if not, after advancingthe uplink receive window of the macro base station by the length of atleast one CP, the micro base station may again detect the uplink SRS andsend the uplink SRS to the macro base station. Therefore, it isimplemented that the micro base station effectively detects the uplinkSRS of the UE, so that the macro base station can identify the UEcausing uplink interference to the micro base station, therebyeliminating the interference. Meanwhile, in the embodiment of thepresent invention, the processing burden caused by multiple times ofdetection constantly performed by the micro base station on allresources may also be avoided.

Referring to FIG. 4, FIG. 4 is a flow chart of another method fordetecting an uplink signal provided in an embodiment of the presentinvention. In the method for detecting an uplink signal shown in FIG. 4,it is assumed that a UE is served by a macro base station, and the UE islocated outside a downlink coverage area of a micro base station and atan edge of the downlink coverage area of the micro base station;meanwhile, the macro base station and the micro base station havesynchronized clock rates, and there is a fixed time difference t1between an uplink receive window of the macro base station and an uplinkreceive window of the micro base station, where |t1|≠0. That is to say,clocks of the macro base station and the micro base station are notaligned. As shown in FIG. 4, the method for detecting an uplink signalmay include the following steps.

401: The macro base station sends, to the micro base station,configuration information about an uplink SRS sent by the UE, andtriggers the micro base station to start detection of the uplink SRSsent by the UE.

402: The micro base station detects, according to the configurationinformation about the uplink SRS sent by the UE, whether the uplink SRSis received in the uplink receive window of the macro base station (atthis time, there is a fixed time difference t1 between the uplinkreceive window of the macro base station and the uplink receive windowof the micro base station), if yes, execute step 404, and if not,execute step 403 and step 404.

403: When the micro base station detects that the uplink SRS is notreceived in the uplink receive window of the macro base station (or inthe uplink receive window of the micro base station, which is the sameas the uplink receive window of the macro base station at this time) instep 402, the micro base station may again detect the uplink SRS afteradvancing the uplink receive window of the macro base station by alength of one CP, and execute step 404.

404: After detecting the uplink SRS sent by the UE, the micro basestation sends the uplink SRS or relevant information (for example, a UEidentifier) about the uplink SRS to the macro base station.

After receiving the uplink SRS sent by the micro base station, the macrobase station may identify that the UE sending the uplink SRS causesuplink interference to the micro base station. That is to say, the UE isan uplink interference source of the micro base station, and at thistime, the macro base station may eliminate the interference of the UE. Aspecific implementation manner in which the macro base station mayeliminate the interference of the UE is common knowledge to persons ofordinary skill in the art, so details are not described herein again inthe embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 4, step 402and step 403 may be arranged in a different order, or may be executed inparallel, which is not limited in the embodiment of the presentinvention. Further, execution of step 402 may be triggered by step 401,and termination of step 403 may be triggered by step 404. Of course, theexecution of step 402 may also be triggered by specific signalingbetween the macro base station and the micro base station, and thetermination of step 403 may also be triggered by specific signalingbetween the macro base station and the micro base station, which is notlimited in the embodiment of the present invention.

In an embodiment, the uplink SRS in the method for detecting an uplinksignal shown in FIG. 4 may also be replaced with an uplink Preamble oran uplink DMRS, which does not influence implementation of the presentinvention and is not limited in the embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 4, the UE isserved by the macro base station, and the UE is located outside thedownlink coverage area of the micro base station and at an edge of thedownlink coverage area of the micro base station; meanwhile, the macrobase station and the micro base station have synchronized clock rates,and there is a fixed time difference t1 between the uplink receivewindow of the macro base station and the uplink receive window of themicro base station have, where |t1|≠0. On such basis, the micro basestation may detect, according to the configuration information about theuplink SRS sent by the UE, whether the uplink signal is received in theuplink receive window of the macro base station, and if not, afteradvancing the uplink receive window of the macro base station by thelength of at least one CP, the micro base station may again detect theuplink SRS and send the uplink SRS to the macro base station. Therefore,it is implemented that the micro base station effectively detects theuplink SRS of the UE, so that the macro base station can identify the UEcausing uplink interference to the micro base station, therebyeliminating the interference. Meanwhile, in the embodiment of thepresent invention, the processing burden caused by multiple times ofdetection constantly performed by the micro base station on allresources may also be avoided.

Referring to FIG. 5, FIG. 5 is a flow chart of another method fordetecting an uplink signal provided in an embodiment of the presentinvention. In the method for detecting an uplink signal shown in FIG. 5,it is assumed that a UE is served by a macro base station, and the UE islocated outside a downlink coverage area of a micro base station and atan edge of the downlink coverage area of the micro base station;meanwhile, the macro base station and the micro base station havesynchronized clock rates, and there is a fixed time difference t1between an uplink receive window of the macro base station and an uplinkreceive window of the micro base station, where |t1|=0. That is to say,clocks of the macro base station and the micro base station areperfectly aligned, and at this time, the uplink receive window of themacro base station and the uplink receive window of the micro basestation are the same. As shown in FIG. 5, the method for detecting anuplink signal may include the following steps.

501: After the micro base station and the macro base station negotiateconfiguration information about an uplink Preamble sent by the UE, themacro base station notifies the UE of the configuration informationabout the uplink Preamble sent by the UE.

In an embodiment, the micro base station may notify the macro basestation of the configuration information, selected by the micro basestation, about the uplink Preamble sent by the UE, or the macro basestation may notify the micro base station of the configurationinformation, selected by the macro base station, about the uplinkPreamble sent by the UE, which is not limited in the embodiment of thepresent invention.

502: The micro base station detects, according to the configurationinformation about the uplink Preamble sent by the UE, whether the uplinkPreamble is received in the uplink receive window of the macro basestation (or in the uplink receive window of the micro base station,which is the same as the uplink receive window of the macro base stationat this time), if yes, execute step 504, and if not, execute step 503and step 504.

503: When the micro base station detects that the uplink Preamble is notreceived in the uplink receive window of the macro base station (or inthe uplink receive window of the micro base station, which is the sameas the uplink receive window of the macro base station at this time) instep 502, the micro base station may again detect the uplink Preambleafter advancing the uplink receive window of the macro base station by alength of one CP, and execute step 504.

504: After detecting the uplink Preamble sent by the UE, the micro basestation sends the uplink Preamble or relevant information (for example,a UE identifier) about the uplink Preamble to the macro base station.

After receiving the uplink Preamble sent by the micro base station, themacro base station may identify that the UE sending the uplink Preamblecauses uplink interference to the micro base station. That is to say,the UE is an uplink interference source of the micro base station, andat this time, the macro base station may eliminate the interference ofthe UE. A specific implementation manner in which the macro base stationmay eliminate the interference of the UE is common knowledge to personsof ordinary skill in the art, so details are not described herein againin the embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 5, step 502and step 503 may be arranged in a different order, or may be executed inparallel, which is not limited in the embodiment of the presentinvention. Further, execution of step 502 may be triggered by step 501,and termination of step 503 may be triggered by step 504. Of course, theexecution of step 502 may also be triggered by specific signalingbetween the macro base station and the micro base station, and thetermination of step 503 may also be triggered by specific signalingbetween the macro base station and the micro base station, which is notlimited in the embodiment of the present invention. Or, the micro basestation and the macro base station may negotiate multiple pieces ofconfiguration information used for detecting uplink preambles sent bythe UE, so that the macro base station may perform continuous detectionon the uplink preambles sent by the UE without triggering and stoppingthe detection.

In the method for detecting an uplink signal shown in FIG. 5, the UE isserved by the macro base station, and the UE is located outside thedownlink coverage area of the micro base station and at an edge of thedownlink coverage area of the micro base station; meanwhile, the macrobase station and the micro base station have synchronized clock rates,and there is a fixed time difference t1 between the uplink receivewindow of the macro base station and the uplink receive window of themicro base station, where |t1|=0. On such basis, the micro base stationmay negotiate the configuration information about the uplink preamblesent by the UE with the macro base station, so that the micro basestation may detect, according to the configuration information about theuplink preamble sent by the UE, whether the uplink signal is received inthe uplink receive window of the macro base station, and if not, afteradvancing the uplink receive window of the macro base station by thelength of at least one CP, the micro base station may again detect theuplink SRS and send the uplink SRS to the macro base station. Therefore,it is implemented that the micro base station effectively detect theuplink preamble of the UE, so that the macro base station can identifythe UE causing uplink interference to the micro base station, therebyeliminating the interference. Meanwhile, in the embodiment of thepresent invention, the processing burden caused by multiple times ofdetection constantly performed by the micro base station on allresources may also be avoided.

Referring to FIG. 6, FIG. 6 is a flow chart of another method fordetecting an uplink signal provided in an embodiment of the presentinvention. In the method for detecting an uplink signal shown in FIG. 6,it is assumed that a UE is served by a macro base station, and the UE islocated outside a downlink coverage area of a micro base station and atan edge of the downlink coverage area of the micro base station;meanwhile, the macro base station and the micro base station havesynchronized clock rates, and there is a fixed time difference t1between an uplink receive window of the macro base station and an uplinkreceive window of the micro base station, where |t1|≠0. That is to say,clocks of the macro base station and the micro base station are notaligned. As shown in FIG. 6, the method for detecting an uplink signalmay include the following steps.

601: After the micro base station and the macro base station negotiateconfiguration information about an uplink Preamble sent by the UE, themacro base station notifies the UE of the configuration informationabout the uplink Preamble sent by the UE.

In an embodiment, the micro base station may notify the macro basestation of the configuration information, selected by the micro basestation, about the uplink Preamble sent by the UE, or the macro basestation may notify the micro base station of the configurationinformation, selected by the macro base station, about the uplinkPreamble sent by the UE, which is not limited in the embodiment of thepresent invention.

602: The micro base station detects, according to the configurationinformation about the uplink Preamble sent by the UE, whether the uplinkPreamble is received in the uplink receive window of the macro basestation (at this time, there is a fixed time difference t1 between theuplink receive window of the macro base station and the uplink receivewindow of the micro base station), if yes, execute step 604, and if not,execute step 603 and step 604.

603: When the micro base station detects that the uplink Preamble is notreceived in the uplink receive window of the macro base station in step602, the micro base station may again detect the uplink Preamble afteradvancing the uplink receive window of the macro base station by alength of one CP, and execute step 604.

604: After detecting the uplink Preamble sent by the UE, the micro basestation sends the uplink Preamble to the macro base station.

After receiving the uplink Preamble sent by the micro base station, themacro base station may identify that the UE sending the uplink Preamblecauses uplink interference to the micro base station. That is to say,the UE is an uplink interference source of the micro base station, andat this time, the macro base station may eliminate the interference ofthe UE. A specific implementation manner in which the macro base stationmay eliminate the interference of the UE is common knowledge to personsof ordinary skill in the art, so details are not described herein againin the embodiment of the present invention.

In the method for detecting an uplink signal shown in FIG. 6, step 602and step 603 may be arranged in a different order, or may be executed inparallel, which is not limited in the embodiment of the presentinvention. Further, execution of step 602 may be triggered by step 601,and termination of step 603 may be triggered by step 604. Of course, theexecution of step 602 may also be triggered by specific signalingbetween the macro base station and the micro base station, and thetermination of step 603 may also be triggered by specific signalingbetween the macro base station and the micro base station, which is notlimited in the embodiment of the present invention. Or, the micro basestation and the macro base station may negotiate multiple pieces ofconfiguration information used for detecting uplink preambles sent bythe UE, so that the macro base station may perform continuous detectionon the uplink preambles sent by the UE without triggering and stoppingthe detection.

In the method for detecting an uplink signal shown in FIG. 6, the UE isserved by the macro base station, and the UE is located outside thedownlink coverage area of the micro base station and at an edge of thedownlink coverage area of the micro base station; meanwhile, the macrobase station and the micro base station have synchronized clock rates,and there is a fixed time difference t1 between the uplink receivewindow of the macro base station and the uplink receive window of themicro base station, where |t1|≠0. On such basis, the micro base stationmay negotiate the configuration information about the uplink preamblesent by the UE with the macro base station, so that the micro basestation may detect, according to the configuration information about theuplink preamble sent by the UE, whether the uplink signal is received inthe uplink receive window of the macro base station, and if not, afteradvancing the uplink receive window of the macro base station by thelength of at least one CP, the micro base station may again detect theuplink SRS and send the uplink SRS to the macro base station. Therefore,it is implemented that the micro base station effectively detects theuplink preamble of the UE, so that the macro base station can identifythe UE causing uplink interference to the micro base station, therebyeliminating the interference. Meanwhile, in the embodiment of thepresent invention, the processing burden caused by multiple times ofdetection constantly performed by the micro base station on allresources may also be avoided.

In the method for detecting an uplink signal shown in FIG. 2 to FIG. 6,when the micro base station detects that the uplink signal is notreceived in the uplink receive window of the macro base station, themicro base station may again detect the uplink signal after advancingthe uplink receive window of the macro base station by the length of oneCP. As an optional implementation manner, when the micro base stationdetects that the uplink signal is not received in the uplink receivewindow of the macro base station, the micro base station may also againdetect the uplink signal after advancing the uplink receive window ofthe macro base station by a length of N CPs, where N is a natural numbergreater than 1. The value of N may be configured by an operationadministration and maintenance (OAM) entity, and may also be calculatedby the micro base station according to a difference between a distancefrom the UE to the macro base station and a distance from the UE to themicro base station, which is not described in detail in the embodimentof the present invention. That is to way, in the embodiment of thepresent invention, the two uplink receive windows in the method fordetecting an uplink signal shown in FIG. 2 to FIG. 6 may be changed intomultiple receive windows, where one is the uplink receive window of themacro base station, and the rest are uplink receive windows obtained byadvancing the uplink receive window of the macro base station by alength of N CPs.

Referring to FIG. 7, FIG. 7 is a flow chart of another method fordetecting an uplink signal provided in an embodiment of the presentinvention. As shown in FIG. 7, the method for detecting an uplink signalmay include the following steps.

701: A UE receives a TA update message sent by a macro base station,where the TA update message is used for instructing to decrease TAallocated by the macro base station to the UE to preset TA.

The TA allocated by the macro base station to the UE refers to TAallocated by the macro base station to the UE in a normal situation.

For example, the preset TA may be ½ of the TA allocated by the macrobase station to the UE, or the preset TA is another numerical value lessthan the TA allocated by the macro base station to the UE, which is notlimited in the embodiment of the present invention.

702: After decreasing the TA allocated by the macro base station to thepreset TA, the UE sends an uplink signal according to the preset TA, sothat a micro base station detects the uplink signal in an uplink receivewindow of the macro base station according to configuration informationof the UE for sending the uplink signal and sends the uplink signal tothe macro base station, where the macro base station and the micro basestation have synchronized clock rates, there is a fixed time differencet1 between the uplink receive window of the macro base station and anuplink receive window of the micro base station, and |t1|≧0.

In an embodiment, the UE may be served by the macro base station, andthe UE may be located outside a downlink coverage area of the micro basestation and at an edge of the downlink coverage area of the micro basestation.

After receiving the uplink signal sent by the micro base station, themacro base station may identify that the UE sending the uplink signalcauses uplink interference to the micro base station. That is to say,the UE is an uplink interference source of the micro base station, andat this time, the macro base station may eliminate the interference ofthe UE.

In an embodiment, the configuration information of the UE for sendingthe uplink signal may at least include a sending frequency channel ofthe UE for sending the uplink signal, that is to say, the configurationinformation of the UE for sending the uplink signal may at least includea sending resource of the UE for sending the uplink signal.

As an optional implementation manner, in the method for detecting anuplink signal shown in FIG. 7, the uplink signal sent by the UE may bean uplink SRS, uplink Preamble, or uplink DMRS sent by the UE, which isnot limited in the embodiment of the present invention.

In the embodiment of the present invention, the macro base station andthe micro base station have synchronized clock rates, and there is afixed time difference t1 between the uplink receive window of the macrobase station and the uplink receive window of the micro base station,where |t1|≧0. On such basis, after decreasing the TA allocated by themacro base station to the preset TA according to the TA update messagesent by the macro base station, the UE may send an uplink signalaccording to the preset TA, so that the micro base station may detectthe uplink signal in the uplink receive window of the macro base stationaccording to the configuration information about the uplink signal andsend the uplink signal to the macro base station. Therefore, it isimplemented that the micro base station effectively detect the uplinksignal of the UE, so that the macro base station can identify the userequipment causing uplink interference to the micro base station, therebyeliminating the interference. Meanwhile, in the embodiment of thepresent invention, the processing burden caused by multiple times ofdetection constantly performed by the micro base station on allresources may also be avoided.

Referring to FIG. 8, FIG. 8 is a flow chart of another method fordetecting an uplink signal provided in an embodiment of the presentinvention. In the method shown in FIG. 8, it is assumed that a UE isserved by a macro base station, and the UE is located outside a downlinkcoverage area of a micro base station and at an edge of the downlinkcoverage area of the micro base station, where the macro base stationand the micro base station have synchronized clock rates, there is afixed time difference t1 between an uplink receive window of the macrobase station and an uplink receive window of the micro base station, and|t1|≧0. As shown in FIG. 8, the method for detecting an uplink signalmay include the following steps.

801: The macro base station sends a TA update message to the UE, wherethe TA update message is used for instructing the UE to decrease TAallocated by the macro base station to ½ of the original TA.

In an embodiment, the TA update message may also instruct the UE toappropriately decrease the TA allocated by the macro base station toanother numerical value, which is not limited in the embodiment of thepresent invention.

802: The UE decreases the TA allocated by the macro base station to ½ ofthe original TA, and sends an uplink signal according to the decreasedTA.

803: If clocks of the micro base station and the macro base station areperfectly aligned, that is to say, |t1|=0, the micro base stationdetects the uplink signal in the uplink receive window of the micro basestation (or in the uplink receive window of the macro base station,which is the same as the uplink receive window of the macro basestation); and if the clocks of the micro base station and the macro basestation are not aligned, that is to say, |t1|≠0, the micro base stationdetects the uplink signal in the uplink receive window of the macro basestation (at this time, there is a fixed time difference t1 between theuplink receive window of the macro base station and the uplink receivewindow of the micro base station).

804: The micro base station sends the detected uplink signal (orrelevant information about the uplink signal) to the macro base station,so that the macro base station can identify the UE causing uplinkinterference to the micro base station, thereby eliminating theinterference.

As an optional implementation manner, in the method for detecting anuplink signal shown in FIG. 8, after the UE sends the uplink signalaccording to the decreased TA, the macro base station may adopt a TAupdate command or other new signaling to instruct the UE to adjust thedecreased TA to the previously allocated TA (that is, the TA allocatedby the macro base station to the UE in a normal situation).

As an optional implementation manner, in the method for detecting anuplink signal shown in FIG. 8, the uplink signal may be any one of anuplink SRS, an uplink Preamble, and an uplink DMRS, which is not limitedin the embodiment of the present invention.

In actual application, because the UE is far from the macro basestation, the TA allocated by the macro base station to the UE (that is,the TA allocated by the macro base station to the UE in a normalsituation) is generally large; because the UE is close to the micro basestation, the uplink signal sent by the UE according to the TA allocatedby the macro base station may reach the micro base station before astarting point of the receive window of the micro base station, so thatthe micro base station cannot detect the uplink signal sent by the UE.However, in the method for detecting an uplink signal shown in FIG. 8,after decreasing the TA allocated by the macro base station to ½ of theoriginal TA or another numerical value according to the instruction ofthe TA update message sent by the macro base station, the UE sends theuplink signal according to the decreased TA, so that it may be ensuredthat the uplink signal sent by the UE is detected by the micro basestation in the uplink receive window of the micro base station or in theuplink receive window of the macro base station.

Referring to FIG. 9, FIG. 9 is a structural diagram of a device fordetecting an uplink signal provided in an embodiment of the presentinvention, and the device for detecting an uplink signal is applied in amicro base station. As shown in FIG. 9, the device for detecting anuplink signal may include a detecting unit 901, a control unit 902, anda sending unit 903, where the detecting unit 901 is configured todetect, according to configuration information of a UE for sending anuplink signal, whether the uplink signal is received in an uplinkreceive window of a macro base station, where the macro base station andthe micro base station have synchronized clock rates, there is a fixedtime difference t1 between the uplink receive window of the macro basestation and an uplink receive window of the micro base station, and|t1|≧0.

In an embodiment, the UE may be served by the macro base station, andthe UE may be located outside a downlink coverage area of the micro basestation and at an edge of the downlink coverage area of the micro basestation.

The control unit 902 is configured to advance the uplink receive windowof the macro base station by a length of at least one CP when thedetecting unit 901 detects that the uplink signal is not received in theuplink receive window of the macro base station.

The detecting unit 901 is further configured to detect the uplink signalafter the control unit 902 advances the uplink receive window of themacro base station by the length of at least one CP.

The sending unit 903 is configured to send the uplink signal detected bythe detecting unit 901 to the macro base station.

After receiving the uplink signal, sent by the sending unit 903, of thedevice for detecting an uplink signal applied in the micro base station,the macro base station may identify that the UE sending the uplinksignal causes uplink interference to the micro base station. That is tosay, the UE is an uplink interference source of the micro base station,and at this time, the macro base station may eliminate the interferenceof the UE.

In an embodiment, the device for detecting an uplink signal shown inFIG. 9 may also include a receiving unit 904, where the receiving unit904 is configured to receive the configuration information, sent by themacro base station, about the uplink signal sent by the UE, and outputthe configuration information to the detecting unit 901.

In an embodiment, the configuration information about the uplink signalmay at least include a sending frequency channel of the uplink signal,that is to say, the configuration information about the uplink signalmay at least include a sending resource of the uplink signal.

As an optional implementation manner, in the device for detecting anuplink signal shown in FIG. 9, the uplink signal may be any one of anuplink SRS, an uplink Preamble, and an uplink DMRS, which is not limitedin the embodiment of the present invention.

Based on the device for detecting an uplink signal shown in FIG. 9, themicro base station may effectively detect the uplink signal sent by theUE, so that the macro base station can identify the UE causing uplinkinterference to the micro base station, thereby eliminating theinterference. Meanwhile, in the embodiment of the present invention, theprocessing burden caused by multiple times of detection constantlyperformed by the micro base station on all resources may also beavoided.

Referring to FIG. 10, FIG. 10 is a structural diagram of a userequipment provided in an embodiment of the present invention. The userequipment shown in FIG. 10 is served by a macro base station, and theuser equipment is located outside a downlink coverage area of a microbase station and at an edge of the downlink coverage area of the microbase station. The macro base station and the micro base station havesynchronized clock rates, and there is a fixed time difference t1between an uplink receive window of the macro base station and an uplinkreceive window of the micro base station, where |t1|≧0. As shown in FIG.10, the UE may include a receiving unit 1001, a control unit 1002, and asending unit 1003, where

the receiving unit 1001 is configured to receive a TA update messagesent by the macro base station, where the TA update message is used forinstructing to decrease TA allocated by the macro base station to theuser equipment (that is, TA allocated by the macro base station to theuser equipment in a normal situation) to preset TA;

the control unit 1002 is configured to decrease the TA allocated by themacro base station to the preset TA; and

the sending unit 1003 is configured to send an uplink signal accordingto the preset TA after the control unit 1002 decreases the TA allocatedby the macro base station to the preset TA, so that the micro basestation detects the uplink signal in the uplink receive window of themacro base station according to configuration information of the sendingunit 1003 for sending the uplink signal and sends the uplink signal tothe macro base station, and the macro base station may identify that theUE sending the uplink signal causes uplink interference to the microbase station, thereby eliminating the interference of the UE.

As an optional implementation manner, in the user equipment shown inFIG. 10, the uplink signal may be any one of an uplink SRS, an uplinkPreamble, and an uplink DMRS, which is not limited in the embodiment ofthe present invention.

Based on the user equipment shown in FIG. 10, the micro base station mayeffectively detect the uplink signal sent by the user equipment, so thatthe macro base station can identify that the user equipment causesuplink interference to the micro base station, and therefore, the macrobase station may eliminate the interference of the user equipment.Meanwhile, based on the user equipment shown in FIG. 10, the processingburden caused by multiple times of detection constantly performed by themicro base station on all resources may also be avoided.

Referring to FIG. 11, FIG. 11 is a structural diagram of a system fordetecting an uplink signal provided in an embodiment of the presentinvention. As shown in FIG. 11, the system for detecting an uplinksignal may include a user equipment 1101, a micro base station 1102, anda macro base station 1103. The user equipment 1101 is served by themacro base station 1103, and the user equipment 1101 is located outsidea downlink coverage area of the micro base station 1102 and at an edgeof the downlink coverage area of the micro base station 1102. The macrobase station 1103 and the micro base station 1102 have synchronizedclock rates, and there is a fixed time difference t1 between an uplinkreceive window of the macro base station 1103 and an uplink receivewindow of the micro base station 1102, where |t1|≧0.

In the system for detecting an uplink signal shown in FIG. 11, the microbase station 1102 includes a device for detecting an uplink signal (notshown in FIG. 11) having the structure shown in FIG. 9.

In the system for detecting an uplink signal shown in FIG. 11, the userequipment 1101 is configured to send an uplink signal. That is to say,the user equipment 1101 sends an uplink signal according to TA allocatedby the macro base station 1103.

In the system for detecting an uplink signal shown in FIG. 11, the macrobase station 1103 is configured to receive the uplink signal sent by theuser equipment 1101 and detected by the micro base station 1102, andidentify the user equipment 1101 as an interference source of the microbase station 1102. Further, the macro base station 1103 may eliminateinterference of the user equipment 1101.

In the system for detecting an uplink signal shown in FIG. 11, the microbase station 1102 may effectively detect the uplink signal sent by theuser equipment 1101, so that the macro base station 1103 can identifythat the user equipment 1101 causes uplink interference to the microbase station 1102, and therefore, the macro base station 1103 mayeliminate the interference of the user equipment 1101. Meanwhile, basedon the system for detecting an uplink signal shown in FIG. 11, theprocessing burden caused by multiple times of detection constantlyperformed by the micro base station 1102 on all resources may also beavoided.

Referring to FIG. 12, FIG. 12 is a structural diagram of another systemfor detecting an uplink signal provided in an embodiment of the presentinvention. As shown in FIG. 12, the system for detecting an uplinksignal may include a micro base station 1201, a macro base station 1202,and a user equipment 1203, where the structure of the user equipment1203 may be shown in FIG. 10, which is not described herein again in theembodiment of the present invention. The user equipment 1203 is servedby the macro base station 1202, and the user equipment 1203 is locatedoutside a downlink coverage area of the micro base station 1201 and atan edge of the downlink coverage area of the micro base station 1201.The macro base station 1202 and the micro base station 1201 havesynchronized clock rates, and there is a fixed time difference t1between an uplink receive window of the macro base station 1202 and anuplink receive window of the micro base station 1201, where |t1|≧0.

The macro base station 1202 is configured to send a TA update message tothe user equipment 1203, where the TA update message is used forinstructing to decrease TA allocated by the macro base station 1202 tothe user equipment 1203 to preset TA; and receive an uplink signal sentby the user equipment 1203 and detected by the micro base station 1201,and identify the user equipment 1203 as an interference source of themicro base station 1201.

The micro base station 1201 is configured to detect the uplink signal inthe uplink receive window of the macro base station 1202 according toconfiguration information about the uplink signal sent by the userequipment 1203, and send the uplink signal to the macro base station1202.

In the system for detecting an uplink signal shown in FIG. 12, the microbase station 1201 may effectively detect the uplink signal sent by theuser equipment 1203, so that the macro base station 1202 can identifythat the user equipment 1203 causes uplink interference to the microbase station 1201, and therefore, the macro base station 1202 mayeliminate the interference of the user equipment 1203. Meanwhile, basedon the system for detecting an uplink signal shown in FIG. 12, theprocessing burden caused by multiple times of detection constantlyperformed by the micro base station 1201 on all resources may also beavoided.

A person skilled in the art may understand that all or part of the stepsof the method in the foregoing embodiments may be implemented by aprogram instructing relevant hardware. The program may be stored in acomputer readable storage medium, and the storage medium may include: aflash drive, a read-only memory (ROM), a random access memory (RAM), amagnetic disk, or an optical disk.

The method for detecting an uplink signal and the relevant device andsystem provided by the embodiments of the present invention areintroduced in detail above. The principle and implementation of thepresent invention are described herein through specific examples. Thedescription about the embodiments is merely provided for ease ofunderstanding of the method and the core ideas of the present invention.Persons of ordinary skill in the art can make variations to the presentinvention in terms of the specific implementation and application scopesaccording to the ideas of the present invention. Therefore, thespecification shall not be construed as a limit to the presentinvention.

What is claimed is:
 1. A method for detecting an uplink signal,comprising: detecting, by a micro base station according toconfiguration information of user equipment, located outside and at anedge of a downlink coverage area of the micro base station, for sendingan uplink signal, whether the uplink signal is received in an uplinkreceive window of a macro base station serving the user equipment,wherein the macro base station and the micro base station havesynchronized clock rates, there is a fixed time difference t1 betweenthe uplink receive window of the macro base station and an uplinkreceive window of the micro base station, and |t1|≧0; and if it isdetected that the uplink signal is not received in the uplink receivewindow of the macro base station, after the micro base station advancesthe uplink receive window of the macro base station by a length of atleast one cyclic prefix, again detecting, by the micro base station, theuplink signal, and sending the uplink signal to the macro base station.2. The method according to claim 1, further comprising: receiving, bythe micro base station, the configuration information sent by the macrobase station.
 3. The method according to claim 1, wherein theconfiguration information about the uplink signal at least comprisessending frequency of the uplink signal.
 4. The method according to claim1, wherein the uplink signal comprises an uplink sounding referencesignal, an uplink preamble, or an uplink demodulation reference signal.5. A method for detecting an uplink signal, comprising: receiving, byuser equipment, a timing advanced update message sent by a macro basestation serving the user equipment, wherein the timing advanced updatemessage is used for instructing to decrease timing advanced allocated bythe macro base station to the user equipment to preset timing advanced;and after the user equipment decreases the timing advanced allocated bythe macro base station to the preset timing advanced, sending, by theuser equipment, an uplink signal according to the preset timingadvanced, so that a micro base station detects the uplink signal in anuplink receive window of the macro base station according toconfiguration information of the user equipment for sending the uplinksignal and sends the uplink signal to the macro base station, whereinthe user equipment is located outside and at an edge of a downlinkcoverage area of the micro base station, the macro base station and themicro base station have synchronized clock rates, there is a fixed timedifference t1 between the uplink receive window of the macro basestation and an uplink receive window of the micro base station, and|t1|≧0.
 6. The method according to claim 5, wherein the configurationinformation about the uplink signal at least comprises sending frequencyof the uplink signal.
 7. The method according to claim 5, wherein theuplink signal comprises an uplink sounding reference signal, an uplinkpreamble, or an uplink demodulation reference signal.
 8. A device fordetecting an uplink signal from user equipment, applied in a micro basestation communicating with a macro base station serving the userequipment, comprising: a detecting unit, configured to detect, accordingto configuration information of the user equipment for sending an uplinksignal, whether the uplink signal is received in an uplink receivewindow of the macro base station, wherein the user equipment is locatedoutside and at an edge of a downlink coverage area of the micro basestation, the macro base station and the micro base station havesynchronized clock rates, there is a fixed time difference t1 betweenthe uplink receive window of the macro base station and an uplinkreceive window of the micro base station, and |t1|≧0; a control unit,configured to advance the uplink receive window of the macro basestation by a length of at least one cyclic prefix when the detectingunit detects that the uplink signal is not received in the uplinkreceive window of the macro base station, wherein the detecting unit isfurther configured to again detect the uplink signal after the controlunit advances the uplink receive window of the macro base station by thelength of at least one cyclic prefix; and a sending unit, configured tosend the uplink signal detected by the detecting unit to the macro basestation.
 9. The device according to claim 8, further comprising: areceiving unit, configured to receive the configuration information sentby the macro base station and output the configuration information tothe detecting unit.
 10. The device according to claim 8, wherein theconfiguration information of the user equipment for sending the uplinksignal at least comprises sending frequency of the user equipment forsending the uplink signal.
 11. The device according to claim 8, whereinthe uplink signal sent by the user equipment comprises an uplinksounding reference signal, uplink preamble, or uplink demodulationreference signal sent by the user equipment.
 12. User equipment capableof communicating with a macro base station serving the user equipmentvia a micro base station, comprising: a receiving unit, configured toreceive a timing advanced update message sent by the macro base station,wherein the timing advanced update message is used for instructing todecrease timing advanced allocated by the macro base station to the userequipment to preset timing advanced; a control unit, configured todecrease the timing advanced allocated by the macro base station to thepreset timing advanced; and a sending unit, configured to, after thecontrol unit decreases the timing advanced allocated by the macro basestation to the preset timing advanced, send an uplink signal accordingto the preset timing advanced, so that the micro base station detectsthe uplink signal in an uplink receive window of the macro base stationaccording to configuration information of the sending unit for sendingthe uplink signal and sends the uplink signal to the macro base station,wherein the user equipment is located outside and at an edge of adownlink coverage area of the micro base station, the macro base stationand the micro base station have synchronized clock rates, there is afixed time difference t1 between the uplink receive window of the macrobase station and an uplink receive window of the micro base station, and|t1|≧0.
 13. The user equipment according to claim 12, wherein theconfiguration information used for sending the uplink signal at leastcomprises sending frequency used for sending the uplink signal.
 14. Theuser equipment according to claim 12, wherein the uplink signalcomprises any one of an uplink sounding reference signal, an uplinkpreamble, and an uplink demodulation reference signal.